Greta Jimenez
Plastic is the most common ocean pollutant, with plastic bags, plastic bottles, food containers, cutlery, wrappers, synthetic rope, and fishing items being the most common plastic items found in the ocean. Other common ocean pollutants include cigarette butts, metal beverage cans, paper bags, agricultural nutrients such as nitrogen, and nonpoint source pollution from runoff, which includes sources such as septic tanks, cars, trucks, boats, farms, and oil. Ocean pollution has severe negative impacts on marine ecosystems, wildlife populations, and human health.
| Characteristics | Values |
|---|---|
| Main sources of ocean pollution | Land (80%) and nonpoint sources (e.g. runoff from rainfall or snowmelt that picks up pollutants from oil, grease, toxic chemicals, farms, septic tanks, vehicles, etc.) |
| Most common pollutants | Plastic (bags), bottles, food containers, cutlery, wrappers, straws, cups, synthetic rope, fishing items, etc.), cigarettes, metal cans, paper bags |
| Effects of pollution | Harm to marine ecosystems and wildlife, human health, coral bleaching, ocean acidification, noise pollution, creation of dead zones due to nutrient pollution, etc. |
| Initiatives to address pollution | Global clean-up efforts, improved waste management and recycling, bans on plastic bags, development of biodegradable alternatives, etc. |
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Plastic pollution
Plastic is the most common ocean pollutant, with billions of pounds of plastic in the ocean, accounting for around 40% of the world's ocean surfaces. It is estimated that 15-51 trillion pieces of plastic are currently in the world's oceans, with plastic items found at depths of 10,975 meters (36,000 feet) in the Mariana Trench.
The primary sources of ocean plastic pollution are rivers and the maritime industry, which includes construction, repair, cargo transportation, and fishing activities. Abandoned fishing nets and gear, such as buoys, traps, crates, and nets, make up a large portion of plastic pollution in the oceans. In addition, plastic waste from land-based sources, such as single-use plastic bags, bottles, food containers, cutlery, wrappers, and straws, also contributes significantly to ocean plastic pollution.
The impact of plastic pollution on marine life is devastating. Marine animals, such as sea turtles, seabirds, seals, and other mammals, often mistake plastic for food, leading to internal injuries, starvation, and death. They can also become entangled in plastic debris, causing further harm and death. Plastic pollution affects marine ecosystems, threatening wildlife populations and even human health.
While the problem of plastic pollution is widespread, there are ongoing efforts to address it. Global clean-up initiatives and local community efforts have helped remove millions of plastic items from oceans and beaches. Additionally, there is a growing focus on reducing plastic consumption, improving waste management practices, and advocating for stricter regulations on plastic production and disposal to prevent plastic pollution from entering the ocean in the first place.
The impact of plastic pollution in the ocean is a significant environmental concern, and addressing it requires collective efforts to reduce, reuse, recycle, and properly dispose of plastic waste.
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Nonpoint source pollution
Eighty percent of marine pollution comes from land-based sources, with nonpoint source pollution being one of the biggest contributors. Nonpoint source pollution is caused by runoff, which occurs when rain or melted snow moves over the ground, absorbing and assimilating pollutants. This can include motor oil and other oil-based chemicals, which can be identified by a rainbow-coloured sheen on the water's surface. This runoff can eventually make its way into streams, lakes, rivers, and oceans, carrying with it harmful pollutants.
The sources of nonpoint source pollution are diverse and numerous, including septic tanks, cars, trucks, boats, farms, ranches, and forest areas. For example, millions of motor vehicles leak small amounts of oil onto roads and parking lots, which can eventually make their way into water bodies. Additionally, dirt, topsoil, or silt from fields or construction sites can run off into waterways, harming fish and wildlife habitats.
Correcting the harmful effects of nonpoint source pollution is challenging and costly. Agencies such as NOAA and the U.S. Environmental Protection Agency work together to monitor, assess, and limit nonpoint source pollution. They develop strategies to control and prevent pollution, both from natural and human sources. Implementing these strategies and restoring damaged areas requires significant resources and collaboration.
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Noise pollution
Marine mammals and other aquatic animals have evolved to rely primarily on sound for communication, survival, and assessing their environment. They use sound for critical activities such as breeding, foraging, maintaining social structures, and avoiding predators. For example, cetaceans (whales, dolphins, and porpoises) send and receive complex sounds to communicate, navigate, find food, and more. Fish and invertebrates also depend on sound for these basic life functions.
The impacts of noise pollution on marine life can be immediate or accumulate over time. It can drive them away from important feeding or breeding grounds, alter their migration routes, and even strand them on beaches, leading to death. Noise pollution can also cause behavioural changes, such as increased anti-predatory behaviour and altered vocalizations, making it harder for members of the same species to recognize each other and communicate effectively.
To address noise pollution in the ocean, there is a need for policies to reduce propeller noise from ships, mitigate the sounds of sonar equipment, seismic air guns, pile driving, and construction. Quieter technologies should also be developed to improve the ocean soundscape and enable the recovery of marine life.
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Oil spills
The effects of oil spills on the environment are immediate and long-lasting. Oil penetrates the plumage of birds and the fur of mammals, reducing their insulating abilities and making them more susceptible to temperature changes and less buoyant in the water. It also poisons and suffocates marine life, including fish, sea birds, otters, whales, dolphins, turtles, and more. Oil spills have been linked to beach closures, fishing bans, and economic losses for industries dependent on the marine environment, such as fishing.
In addition to the ecological impact, oil spills pose a risk to human health. They can contaminate drinking water supplies and cause respiratory and reproductive problems, liver damage, and immune system issues. Oil spills can also increase fire hazards and affect air quality, as seen in the Deepwater Horizon explosion and the Kuwaiti oil fires, which had significant consequences for human health and the environment.
The cleanup and restoration process after an oil spill is complex and costly. It involves assessing the impacts, holding responsible parties accountable, and implementing restoration projects. Despite these efforts, environmental experts warn that the damage caused by oil spills can be long-term or even irreparable in some cases.
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Cigarette butts
The persistence of cigarette butt pollution is influenced by various factors. Some smokers choose to discard their butts onto the ground or beaches instead of using ashtrays or garbage bins. This behaviour may stem from a perception that filters are biodegradable or a desire to express a "rebellious" attitude associated with smoking. The lightweight nature of cigarette butts also makes them easy to miss during cleanups and contributes to their dispersal over vast areas.
Communities worldwide are taking action to address this issue. Volunteers with the NGO Ocean Conservancy have collected over 60 million cigarette filters since 1986, and organisations are focusing on curbing this significant ocean contaminant. Additionally, there is a growing movement to ban cigarette filters altogether, recognising their detrimental impact on marine life and the potential risks to human health.
Cigarette butt pollution is a pressing environmental concern, and the collective efforts of individuals, communities, and organisations are vital to mitigating this global issue.
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Frequently asked questions
The most common ocean pollutants are plastics, nutrients from fertilizer runoff, nonpoint sources, light, noise, and industrial chemicals.
Common plastic pollutants include plastic bags, bottles, food containers, cutlery, wrappers, straws, cups, plates, and synthetic rope.
Nonpoint source pollution occurs when rainfall or snowmelt moves across the ground, picking up pollutants such as oil, grease, and toxic chemicals from energy production and daily activities, and depositing them into bodies of water.
Nutrient pollution occurs when excess nutrients, typically nitrogen and phosphorus, enter bodies of water and act as fertilizers. This can lead to the growth of algae, which, when it decomposes, consumes oxygen and creates dead zones where marine life cannot survive due to lack of oxygen.
Noise pollution from shipping and military activity can cause cellular damage to invertebrates like jellyfish and anemones, which are a vital food source for many larger creatures.
